I'm building severals filters last year.
I suggest to you:
1)download the program Dishal on the web
2)Buy 20-30 crystals on ebay.
3)Test the crystals with G3UUR method
4)Select 10 crystals after test
5)Start with program Dishal with QER filter (more simple) that ladder type.
Test set do you need:
1)Good LC meter (more accurate)
2)Spectrum analyser with tracking generator to test the filter or VNA
3)A lot of self control.
Build a good filter is not simple,the program help you but after build it you must test and correct it for a good result.
Same images of one filter that I build.
To measure the crystals I use the G3UUR mode,I built an oscillator for
crystals ad with program dishal I select the crystals.
Sorry for bad English!!!!
For information or same images we could write to email@example.com
73 de iw3sgg Noris.